Works great! - C-MORE Tactical Railway Red Dot Sight w/ Click Switch

Works great! Good glass. Aluminum chassis is pretty much bombproof. I like the fact that I can easily swap the module for a different MOA dot size if I desire. The railway system fits an A3 upper but doesn't leave enough room for a Magpul MBUS rear sight unless you move the C-More onto your front rail a notch or the rear sight hangs off the rear of the upper a little or you run a different(smaller) rear sight. The railway mount comes with a spacer so you can vary the mounting height of you want. You will have to get 2 shorter screws for the mount if you do though. The screws were easily found at Fastenal.

Overall, I'm very happy so far...